How do you know that?
Let me put it this way: where do you find evidence that the identified authors wrote the Gospels?
Does it matter who penned it?
Only to the extent that it was or was not penned with Apostolic imprimatur.
Was it given the Church imprimatur?
Do you reject Daniel?
No. Why would I? Are you going to tell me that the LORD Jesus Christ was mistaken when he referred to the visions of Daniel as true prophecies and explicitly named Daniel as their writer?
Where does Jesus explicitly name Daniel as the author?
If you look at my posts previously in this thread you will see some of the evidence. One of the evidences concerns the question I have been asking you, to which I have not yet seen a specific answer: If the Gospels were not originally identified as to the author, as you claimed, why is there no other surviving tradition of another author for the Gospels? If the Gospels did not receive their titles early inevitably a multiplicity of titles would have arisen as people speculated about who had written them, a problem which would have only gotten worse with the passage of time and increasing number of copies being circulated and being given different titles by different libraries and collectors.
Moreover, as I have asked you before, how did these anonymous writers convince the early church that they knew what they were writing about? How could the early church accept them as authoritative unless they knew who had written them and that the writers knew what they were writing about? And how in the world did these anonymous writers manage to bamboozle first and second generation eyewitnesses that their anonymous writings were authoritative? Why was there, as far as we know from the surviving evidence, no speculation about who had written these "anonymous" Gospels?
If you are going to make a claim, as you did, that the Gospels were not originally identified as to the author then the burden of proof to provide positive evidence for the claim is on you. You need to explain how to overcome the foregoing critical problems inherent in your claim.
Was it given the Church imprimatur?
Yes. These writings came to be recognized as inspired revelation of God which is the source of their authority, and in the first 2 centuries of the Church apostolic authenticity and/or authority was the criteria for deciding to keep or reject a particular writing.
Where does Jesus explicitly name Daniel as the author?
Cordially,